Hyperthreading were disabled in the BIOS. It's the default setting in"fail safe" but curiously also in "optimized settings".

It is now enabled together with the acpismp=force in lilo. Note howeverthat the "WARNING: No sibling found" messages are still there. Strange?

The newly compiled kernel is without highmem as suggested and the BIOSvalues for UDMA have been updated (the reason they showed UDMA33 werebecause of "fail safe" BIOS settings, sorry for missing that).

> See if a single CPU kernel is reliable

I will if this highmem off setting doesn't fix it. I really need bothworking or the load will skyrocket :-(

>Ensure your ventilation is fine and your PSU is approved

Both are excellent, should not be an issue.

The new boot messages, with acpismp=force and HT enabled in BIOS, note newACPI messages, like "Searched entire block, no RSDP was found". Problem?